This latest version AmpPRO simplifies the installation of upgraded amplifiers in select non-amplified and amplified sound systems  With AmpPRO, you can improve audio performance while keeping an original radio’s fit, finish and features.  Benefits  Simplifies amplifier installation Prevents need for summing and DSP devices Provides factory sound system upgrade solution Provides flat audio output for a solid audio foundation Features Can be used to upgrade the entire sound system or just part of it thanks to retention of the original amplifier Enables the addition of a subwoofer to an amplified sound system Variable volume, fade, balance, bass, mid and treble audio settings Front, rear, sub preamp outputs (5 volt RMS) Customized OE bass, mid and treble center frequency selection Retains uConnect, Bluetooth audio, Navigation prompts, and all warning chimes Plug-n-Play installation Sub level controller Optional TOSLINK optical output (APA-TOS1 sold separately)  Includes AmpPRO module 52-pin harness (MS CAN) Bass knob with harness Manual Also available for fast easy install: APH-CH01 harness (sold separately) Select non-amplified vehicles are equipped with an ANC system that requires bypass.  Plug-n-Play bypass harness: ANC-CH01  PLEASE CHECK COMPATIBILITY OF YOUR VEHICLE ON www.pac-audio.com BEFORE ORDERING. WE CANNOT ACCEPT RETURNS ON THIS ITEM.